:root {
    /* Default (Light Mode) */
    --bg-color: #f5f5f5;
    --container-bg: #ffffff;
    --text-color: #242424;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --primary-color: #6264A7;
    --primary-hover: #53558e;
    --slot-bg: #ffffff;
    --slot-hover: #f0f0f0;
    --slot-selected-bg: #6264A7;
    --slot-selected-text: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --danger-color: #d13438;
    --danger-hover: #a80000;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-color: #1f1f1f;
    --container-bg: transparent; /* Blends with Teams background */
    --text-color: #ffffff;
    --card-bg: #292929;
    --border-color: #484644;
    --primary-color: #7f85f5; /* Lighter purple for dark mode */
    --primary-hover: #9ea2ff;
    --slot-bg: #292929;
    --slot-hover: #3b3a39;
    --slot-selected-bg: #7f85f5;
    --slot-selected-text: #000000;
    --shadow: none;
    --danger-color: #e81123;
    --danger-hover: #ff4d4d;
}

/* High Contrast Mode */
[data-theme="contrast"] {
    --bg-color: #000000;
    --container-bg: #000000;
    --text-color: #ffffff;
    --card-bg: #000000;
    --border-color: #ffffff;
    --primary-color: #ffff00;
    --primary-hover: #ffff00;
    --slot-bg: #000000;
    --slot-hover: #1a1a1a;
    --slot-selected-bg: #ffff00;
    --slot-selected-text: #000000;
    --shadow: none;
    --danger-color: #ffff00;
    --danger-hover: #ffff00;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 480px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--text-color);
}

/* Queue Dashboard */
.queue-dashboard {
    margin-bottom: 30px;
}

.queue-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.queue-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

.queue-card h2 {
    font-size: 0.9rem;
    margin: 0 0 12px 0;
    opacity: 0.9;
}

.queue-metric {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.queue-metric strong {
    font-size: 1rem;
}

/* Booking Form */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.slots-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.time-slot {
    background-color: var(--slot-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px;
    text-align: center;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    color: var(--text-color);
}

.time-slot:hover {
    background-color: var(--slot-hover);
    border-color: var(--primary-color);
}

.time-slot.selected {
    background-color: var(--slot-selected-bg);
    color: var(--slot-selected-text);
    border-color: var(--slot-selected-bg);
    font-weight: bold;
}

.summary {
    background-color: var(--bg-color);
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    text-align: center;
    display: none;
    border: 1px solid var(--border-color);
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.submit-btn:hover {
    background-color: var(--primary-hover);
}

.submit-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.6;
}

/* My Booking Card */
.my-booking-card {
    background: var(--card-bg);
    border: 1px solid var(--primary-color);
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    text-align: center;
    margin-bottom: 20px;
}

.my-booking-time {
    font-size: 2em;
    font-weight: bold;
    color: var(--primary-color);
    margin: 10px 0;
}

.action-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 15px;
}

/* Modal Styles */
.custom-modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none; justify-content: center; align-items: center;
    z-index: 9999;
}
.custom-modal-box {
    background: var(--container-bg);
    color: var(--text-color);
    padding: 24px;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    text-align: center;
    font-family: 'Segoe UI', sans-serif;
    max-height: 80vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}
.menu-btn {
    display: block;
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
}
.menu-btn:hover {
    background: var(--hover-bg);
}
.menu-btn.primary {
    background: var(--primary-color);
    color: var(--slot-selected-text);
    text-align: center;
    font-size: 1.1em;
    padding: 16px;
}
.menu-btn.primary:hover {
    opacity: 0.9;
}
.menu-btn.danger {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
    text-align: center;
}
.menu-btn.danger:hover {
    background: var(--danger-hover);
}
.back-link {
    display: block;
    margin-top: 15px;
    color: var(--text-color);
    opacity: 0.7;
    cursor: pointer;
    text-decoration: underline;
    font-size: 14px;
}
.modal-header {
    margin-bottom: 20px;
    font-size: 1.2em;
    font-weight: bold;
}